The debug works like :

1º I started by doing a "fresh" installation of Ubuntu

2º I checked the system first and i tried to use the wifi. (won´t work) 
The files are:
-> iwconfig.txt;
-> Hardware_data.txt (Data of the chipset);
-> dmesg_first (dmesg report)
-> Pictures -> first_1 (wifi list) , first_2 (trying to use) , first_3 (wifi 
list disappeared)
-> dmes_sec.txt

3º applying commands

-> modprobe -rv r8822be
-> modprobe -v r8822be aspm=0

4º Wifi working but 2.4ghz normal and 5ghz very slow
-> iwconfig_after.txt
-> dmesg_after.txt

** Attachment added: "Debug data"

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  Wifi  realtek 8822be BUG <=18.04

Status in linux package in Ubuntu:

Bug description:
  I am a regular linux user and i have bought last week a new computer
  that comes with the realtek 8822be wireless chipset.

  While using Ubuntu 16.04(Kernel version updated to 4.14 where we
  started to have support to this chipset) or both 18.04 beta 1 and
  final version i found a problem:

  1º when i boot all this versions with the kernel version >= 4.14, i
  found out that the driver is instaled and she is detected in the
  network manager.Anyway, when i used she won´t work and in few secconds
  later will shutdown. When i go to the wifi settings i can´t find

  2º I use modprobe so that i can manipulate my drivers/modules and i can start 
to work with my wifi card:
  -> modprobe -rv r8822be
  -> modprobe -v  r8822be aspm=0

  The problem is that when i connect to a 5ghz frequency router, i have
  very slow download speed 8 mbps max (Usually my speed is approximately
  200/210 mbps in wifi mode).In the outher hand when i connect  to a
  2.4ghz frequency router it works fine!


  Best regards
  ApportVersion: 2.20.9-0ubuntu2
  Architecture: amd64
   /dev/snd/controlC0:  teste      1285 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 18.04
  HibernationDevice: RESUME=UUID=9fdace6b-915c-4770-8261-aa8dcaa735b1
  InstallationDate: Installed on 2018-04-07 (0 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Beta amd64 (20180404)
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-13-generic.efi.signed 
root=UUID=1d0c4a1b-32fe-43b2-ae21-2b0d9101e5fc ro quiet splash vt.handoff=1
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
   linux-restricted-modules-4.15.0-13-generic N/A
   linux-backports-modules-4.15.0-13-generic  N/A
   linux-firmware                             1.173
  StagingDrivers: r8822be
  Tags:  bionic staging
  Uname: Linux 4.15.0-13-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True 08/04/2017
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X411UN.300
  dmi.board.asset.tag: ATN12345678901234567 X411UN
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
dmi:bvnAmericanMegatrendsInc.:bvrX411UN.300:bd08/04/2017:svnASUSTeKCOMPUTERINC.:pnX411UN:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX411UN:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: X X411UN
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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